A 50-kg mass is dropped from a 20-m height onto a very long, initially uncompressed spring of force constant k = 100 N/m
F=k(Lenght Final-length initial)
The Attempt at a Solution
I tried using Ueo=Ugf+Uef, and i couldnt figure out what to use for some of the values.
so far i got 1/2*4.9^2=Ugf+Uef, i dont know what to put for the final heights.